Entry 2 senses · 2 variants Webster, 1913 Inwall /(ĭn*wa̤l")/ · In·wall · IPA v. t. n. 01 v. t. To inclose or fortify as with a wall. imp. & p. p. Inwalled; p. pr. & vb. n. Inwalling 1. To inclose or fortify as with a wall. 02 n. An inner wall; specifically (Metal.), the inner wall, or lining, of a blast furnace. 1. An inner wall; specifically (Metal.), the inner wall, or lining, of a blast furnace.(Metal.)